void test_decrease_key(){
FibHeap fib;
int NUM_NODES = 100;
boost_heap pq;
map<int, boost_heap::handle_type> index;
vector<int> keys;
set<int> keyset; // Used for getting logarithmic random generation and duplicate detection
for (int i = 0; i < NUM_NODES; i++){
unsigned int curr = rand();
if (present(keyset, curr)) continue;
fib.insertNode(curr);
index[curr]=pq.push(curr);
keys.push_back(curr);
keyset.insert(curr);
if (i % 25 == 0){
//Do some random decrease keys
for (int j = 0; j < 20; j++){
//Pick a key to change
unsigned int to_change_index = rand() % keys.size();
unsigned int to_change_val = keys[to_change_index];
if (to_change_val == 0) continue;
//Find a smaller value to change to which doesnt already exist
// Or try for a bit
unsigned int new_val = rand() % to_change_val;
for (int k = 0; k < 100; k++){
if (present(keyset, new_val))
new_val = rand() % to_change_val;
else break;
}
if (present(keyset,new_val)) continue;
//replace the old value with new one
keys[to_change_index] = new_val;
keyset.erase(to_change_val);
keyset.insert(new_val);
//perform operation on heaps
pq.decrease(index[to_change_val],new_val);
index[new_val] = index[to_change_val];
index.erase(to_change_val);
fib.decreaseKey(to_change_val, new_val);
}
}
if (i%50 == 0){
int num_deletes = rand() % fib.getSize()+1;
for (int j = 0; j < num_deletes; j++){
unsigned int val= fib.deleteMin();
unsigned int ref = pq.top();
pq.pop();
if (val != ref){
cout << "\n Random : Our value: " << val << " Ref Value: " << ref;
return;
}
keyset.erase(val);
std::vector<int>::iterator position = std::find(keys.begin(), keys.end(), val);
if (position != keys.end()) // == vector.end() means the element was not found
keys.erase(position);
else cout << "Should never get here, keys messed up";
index.erase(val);
}
}
}
cout <<"Test completed";
}
